Cruise Control: Description and Operation

SYSTEM OUTLINE
The cruise control system is a constant vehicle speed controller in which control of the switch on the instrument panel makes it possible to automatically adjust the opening of the engine throttle valve without depressing of the accel. pedal.

1. SET OPERATION
When the cruise control main SW is turned on, the system starts preparations necessary for the cruise control and turns on the indicator light in the combination meter.

2. SET SPEED CONTROL
When the SET/COAST SW is operated with the cruise control main SW turned on during travelling, the constant vehicle speed is controlled.

3. COAST CONTROL
During cruise control driving, while the SET/COAST SW is ON, the motor in the cruise control actuator rotates to close the throttle valve, and decrease the driving speed.
Every time the SET/COAST SW is turned on instantaneously, the vehicle speed is decelerated approximately 1.5 kph.

4. ACCEL CONTROL
During cruise control driving, while the RES/ACC SW is ON, the motor in the cruise control actuator rotates to open the throttle valve, and increase the driving speed.
Every time the RES/ACC SW is turned on instantaneously, the vehicle speed is accelerated approximately 1.5 kph.

5. RESUME CONTROL
When the vehicle speed is within the low speed limit if the cruise control is cancelled, use of the RES/ACC SW accelerates the vehicle to the speed level used before canceling the cruise control.

6. MANUAL CANCEL MECHANISM
If any of the following signals is input during cruise control travelling, the cruise control is cancelled.
- The stop light SW is turned on.
- The CANCEL SW is turned on.
- The cruise control main SW is turned off.
- When the shift lever is in a position other than D position

7. AUTO CANCEL FUNCTION
If any of the following conditions is encountered, the cruise control is automatically cancelled.
- The stop light SW wiring is faulty or short - circuited.
- The vehicle speed signal is faulty.
- In case of over current to the transistor, driving motor, or electromagnetic clutch
- When the vehicle has stopped due to voltage decrease
- When the vehicle speed falls below the minimum speed limit

8. OVERDRIVE CONTROL FUNCTION
The overdrive control may be cancelled if the vehicle travels on the slope during cruise control travelling. After the overdrive control has been cancelled, if the vehicle speed exceeds the overdrive return speed and it is decided that the slope is finished, the vehicle returns to the overdrive control mode again.